linux-kernel - Re: [PATCH] drm/ssd130x: Silence a `dubious: x & !y` warning

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Message-ID: <9bc96f9d-8e3a-7c71-c9fe-088c9d086f2a@redhat.com>
Date:   Tue, 24 Jan 2023 11:10:45 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/ssd130x: Silence a `dubious: x & !y` warning

On 1/21/23 20:09, Javier Martinez Canillas wrote:
> The sparse tool complains with the following warning:
> 
> $ make M=drivers/gpu/drm/solomon/ C=2
>   CC [M]  drivers/gpu/drm/solomon/ssd130x.o
>   CHECK   drivers/gpu/drm/solomon/ssd130x.c
> drivers/gpu/drm/solomon/ssd130x.c:363:21: warning: dubious: x & !y
> 
> This seems to be a false positive in my opinion but still we can silence
> the tool while making the code easier to read. Let's also add a comment,
> to explain why the "com_seq" logical not is used rather than its value.
> 
> Reported-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
> ---
>

Pushed this to drm-misc (drm-misc-next). Thanks!

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat